Sabeleye, Lickilicky, and most importantly, Ditto all got major improvements that will likely help them rise in usage. Heck, even Seaking got an immunity to Electric attacks. As for those worrying about it's former position of one of the worst fully evolved Pokémon it the game, don't worry, Lumineon fills up that space left behind quite nicely, so Luvdisc won't feel so lonely.
As for Porygon2...
I hoped...
I thought of the idea...
I dreamt of the notion...
As soon as I learned of the Miracle [of Evolution]...
I cheered.
Porygon2, now equipped with the Prevolution Stone, has defenses on par with giants such as Deoxys-D and Lugia! Coupled with the fact that It has higher Special Attack then both, along with Trace, makes it very, very formidable.
However...
As for Porygon-Z on the other hand, all it got was Analyze (This coupled with the fact that it is the only Pokémon to learn Trick-Room naturally is starting to make me think that Game Freak considers it bulky...), a hand-me-down from Porygon2, and Psycho-Shock, which though is only really useful for taking down Blissey, is still a much better option to attempting to go mixed (no thanks to Download), or relying on Hyper Beam.
Oh well, I'm just happy that Porygon2 is now to the extreme! (Being able to learn Curse again wouldn't hurt, though!)